セリアゾルの製造方法 - Daiichi Rare Element Chemical Industry Co., Ltd.

Title:

セリアゾルの製造方法

Document Type and Number:

Japanese Patent JP4731220

Kind Code:

B2

Abstract:

To provide a method for efficiently producing a high purity ceria sol at a high yield, which is a monodispersed sol, has an average particle diameter of 5-15 nm and is used in applications such as ceramic materials, polishing agents, ultraviolet absorbers, thin film materials or coating materials.

The method for producing the ceria sol comprises preparing a reactive dispersion by mixing cerium hydroxide or hydrated cerium oxide, nitric acid and pure water so that the cerium concentration becomes 20-50% expressed in terms of Ce2O3and the molar ratio of HNO3to Ce becomes 0.1-0.8, then keeping the reactive dispersion at 80-150°C to form a precipitate of a reversible aggregate of formed ceria sol particles, and dispersing the precipitate by diluting it with water.

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Inventors:

Takasaki

Application Number:

JP2005190575A

Publication Date:

July 20, 2011

Filing Date:

June 01, 2005

Export Citation:

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Assignee:

Daiichi Rare Element Chemical Industry Co., Ltd.

International Classes:

C01F17/00

Domestic Patent References:

JP2006182604A
JP2006045015A
JP2003301167A
JP7048123A
JP5132311A
JP3232721A
JP1148710A

Other References:

上川直文ほか,水酸化セリウム沈殿の水溶液中での解膠による酸化セリウムなの粒子分散ゾルの調製,日本化学会講演予稿集,日本,2004年 3月11日,Vol.84th No.1,Page.246

Attorney, Agent or Firm:

Eiji Saegusa
Mutsuko Nakano
Masahito Hayashi
Takahiro Hishida

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